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Comment on Calves in the Snowstorm
I narrowed my choices down to
Any advice on when to use have/had as plural/singular instead of present/past tense?
"Had" can be both singular
"Had" can be both singular and plural, which means it tough. The trick is to focus more on the issues of tense when you see the word "had."
Answer choice E suggests that the same cows that were killed last week may be receiving vaccinations up to the present day.
Couldn't option C be
Yes, that's how we should
Yes, that's how we should interpret answer choice C.
Two actions occurred in the past (killing/injuring and receiving)
The killing/injuring of the cows is a completed event in the past. So, we use the simple past tense (RECEIVED)
The receiving (of the vaccine) is a completed past event that occurred BEFORE the killing/injuring. So, we use the past perfect tense (HAD RECEIVED)
More on past perfect tenses here: https://www.gmatprepnow.com/module/gmat-sentence-correction/video/1178
Here's a similar question from the Official Guide: https://gmatclub.com/forum/some-buildings-that-were-destroyed-and-heavil...
Does that help?
But isn't the original
I can see your point. However
I can see your point. However, I think the degree to which C is ambiguous is pretty small. "last week's storm" and "the storm last week" are pretty close in meaning.
The thing with the GMAT is that, in many cases, we're not necessarily looking for the perfect answer; we're looking for least bad answer.
You'll see that the official question that I linked about, suffers from the same level of potential ambiguity.